Solved Setting permissions for plugin?

Hi there,
I am new to a rust server, just rented my first one and want to play with the plugins.

I've added the sign artist one, and i know i need to set the permissions to allow user to use it,
I've tried

'grant guys signartist.url 0'

guys is a group i made that has my friends in it.

When i type that command, it says that permission 0 doesn't exist,

What permission do i need to put in the command to allow them to use sign artist?

 

The correct command would be: grant group guys signartist.url

 

Using the Oxide permission system | Oxide

 

Thanks for the help guys.